Briefly describe the five main roles of alloying elements in steel?

For NM500 wear-resistant steel plate, the chemical composition is more worthy of analysis. In fact, the traditional wear-resistant steel used in construction machinery is generally high manganese steel, although high manganese steel has the performance of work hardening, but it has a strong hardening ability after being subjected to impact stress during its use. Due to such a reason, it can only play its role under a large impact load, and the wear resistance of its hardness can not be improved for the working condition that the impact load is not large, in this case, the yield strength of high manganese steel is not high after work hardening, and the workpiece sometimes cracks when under the action of a large force, and it is difficult to achieve the expected service life, which is a fatal defect for machinery.

However, compared with high manganese steel, in recent years, low-alloy wear-resistant steel has also been used to make small and medium-sized mechanical materials, and it has also been applied in the field of construction machinery to extend and expand the use of high manganese steel, which has been considered to be the trend of the machinery industry.

Chemically, the actual key is whether the hardness of the product can ensure the wear resistance of the material, and the hardenability and hardness of the steel depend on the carbon content. The design characteristics of the chemical composition fully consider the hardness and wear resistance and welding, forming, impact toughness and other factors, and the lower carbon content is used to make the steel obtain higher hardness after quenching, and the NM500 wear-resistant steel plate has enough plasticity and toughness to meet the comprehensive mechanical properties of construction machinery. Achieving such a balance point is the ultimate goal of NM500 wear resistant steel plates.

Generally, copper alloys are divided into three categories: brass, bronze and cupronickel. Brass (H

A copper alloy with zinc as the main alloying element is called brass. Bronze (q

Bronze originally referred to copper-tin alloy, but it is customary in industry to call copper-based alloys containing aluminum, silicon, lead, manganese, etc. bronze.

Nickel and its alloys. Nickel and nickel alloy are ideal metal materials in various harsh corrosive environments such as chemical, petroleum, non-ferrous metal smelting, high temperature, high pressure, high concentration or mixed with impurities.

Titanium and its alloys. Titanium has a high melting point, a small coefficient of thermal expansion, poor thermal conductivity, low strength and good plasticity. Titanium has excellent corrosion and heat resistance, and its oxidation resistance is better than that of most austenitic stainless steels, while titanium can still maintain high strength at higher temperatures.

Titanium has excellent corrosion resistance at room temperature, and is very stable in the atmosphere, seawater, nitric acid and alkali solutions, but can be quickly dissolved in any concentration of hydrofluoric acid.

Lead and its alloys.

Lead is very stable in the atmosphere, fresh water and seawater, and lead has good corrosion resistance to sulfuric acid, phosphoric acid, sulfurous acid, chromic acid and hydrofluoric acid. Lead is not resistant to nitric acid and is also unstable in hydrochloric acid.

Magnesium and its alloys. Magnesium alloy is an important structural material in the aviation industry, which can withstand large shock and vibration loads, and has good machinability and polishing properties. Its disadvantages are poor corrosion resistance, high notch sensitivity and complex melting and casting process.

<>1. Increase the mechanical properties of solution strengthened steel;

2. Increase the hardenability of steel and improve the mechanical properties of steel;

3. Improve the corrosion resistance of steel;

4. To improve the high-temperature performance of steel, different alloying elements will be added according to the use conditions of steel.

Alloying elements refer to the addition of a certain amount of one or more metallic or non-metallic elements in the process of refining metals.

Special properties of the material can be obtained, such as increased strength, improved oxidation resistance, improved plasticity and process properties, etc. These auxiliary element materials are called alloying elements.

The chemical elements that make up the alloy.

Most of them are metallic elements such as copper, tin, lead, aluminum, manganese, chromium, molybdenum, nickel and rare metals.

Wait. A few are non-metallic elements such as carbon, silicon, phosphorus, etc.

Summary. Hello, dear, the permanent elements in the steel manganese, silicon, sulfur and phosphorus are brought in due to the impurities contained in the ore and coke and deoxidation in the process of ironmaking and steelmaking, which has a certain impact on the performance of steel. There are four common permanent elements: silicon, manganese, sulfur and phosphorus.

In what form do alloying elements exist in steel? What are the effects on the properties of steel?

<>1. Increase the mechanical properties of solution strengthened steel;

2. Increase the hardenability of steel and improve the mechanical properties of steel;

3. Improve the corrosion resistance of steel;

4. Improve the high-temperature performance of steel.

Depending on the conditions under which the steel is used, different alloying elements are added.